gen_an_index

# File lib/rdoc/generators/html_generator.rb, line 1493
    def gen_an_index(collection, title)
      res = []
      collection.sort.each do |f|
        if f.document_self
          res << { "href" => f.path, "name" => f.index_name }
        end
      end

      return {
        "entries" => res,
        'list_title' => title,
        'index_url'  => main_url,
      }
    end